ETA: The text above contained a reference to taking my business to the The Book Depository, but eggsbenedict points out that The Book Depository was bought by Amazon last year. I don't know exactly how this is impacting the running of the company, but removed the reference just to make sure. Apparently Amazon also owns Abebooks and a bunch of other book-related companies, including some I use and give money to, such as LibraryThing.

Again, I don't know what being owned by Amazon means for these companies and if it has any influence on, for instance, their content policies. Maybe there's no influence. However, it does seem clear that I'm absolutely unable to buy legal copies of some of the e-books I want or need for work without financially benefiting Amazon. It's not a sign of a healthy system if it's completely impossible anywhere in the world to buy a legal copy of a certain book without somehow going through this one single distributor.